SUBSTITUTIONpublished at 17:17 Greenwich Mean Time 8 March 2015
Celtic make another change and it's Stefan Scepovic who comes on for Leigh Griffiths.
Semi-final draw - Inverness CT or Raith v Dundee Utd or Celtic, Falkirk v Hibs
QF: Dundee United 1-1 Celtic
QF: Hibernian beat Berwick 4-0 at Easter Road
Roddie McVake
Celtic make another change and it's Stefan Scepovic who comes on for Leigh Griffiths.
Dundee United have had a few free-kicks in the last 10 minutes and their delivery has been woeful on every occasion.
Celtic's James Forrest knocks the ball into the box for John Guidetti, but his right-foot shot is well over the bar.
We're into the last 10 minutes at Tannadice and Celtic are pretty much camped out in the Dundee United half. Can they find a winner against the nine men of United?
Celtic's Leigh Griffiths produced an excellent header to make it 1-1 at Tannadice.
Midfielder Nir Bitton tries an effort from outside the box, it moves in the air but it drifts wide of the Dundee United goal.
Celtic's John Guidetti goes down the left and floats a ball into the box, it looks destined for the head of Leigh Griffiths but Radoslaw Cierzniak leaps out and snatches it.
Dundee United are facing a tough last 15 minutes with only nine men. Their defence is holding out for now, but it's all looking a bit disjointed for the hosts.
Jack in Edinburgh: "What an appalling performance by the officials. How can Craig Thomson continue as a Grade One referee after this?"
Dylan from Shetland: "What a game! What's the odds for a 4th red card?"
Leigh Griffiths makes up for his earlier penalty miss with a sensational header to haul Celtic level. Stefan Johansen provides the perfect delivery and Griffiths plants a brilliant header into the bottom corner.
Celtic sub John Guidetti has a chance but his close-range effort from the angle is saved by Radoslaw Cierzniak.
It's all-action now folks...
Celtic have Dundee United pegged back but the hosts break upfield and Calum Butcher races into the box, only to see his shot is saved by Craig Gordon.
Celtic manager Ronny Deila makes a change with Anthony Stokes off and Swedish striker John Guidetti on.
United then make a change, Ryan Dow is off and Chris Erskine is on.
Leigh Griffiths had a golden opportunity to haul Celtic level but his penalty was expertly saved by United keeper Radoslaw Cierzniak
Celtic's James Forrest goes on a great run and finds Anthony Stokes, but his driven effort is well saved by Radoslaw Cierzniak.
Celtic's Leigh Griffiths gets in a header from Emilio Izaguirre's cross but the ball falls just over the bar.
Dundee United's Nadir Ciftci celebrates with manager Jackie McNamara after scoring from the spot to send his side 1-0 up against Celtic.
Dundee United take off Aidan Connolly, with defender John Souttar on as they attempt to shore things up.
That was a huge chance for Celtic to square the match and United will be over the moon to still be in front. They are, however, down to nine men...
Celtic striker Leigh Griffiths takes the penalty and Radoslaw Cierzniak makes a brilliant save to his left.